So the oven is getting heavy and in order to conserve weight i went with o60 – 16 gauge cold rolled sheet for the roof. The only problem is that it needs to be supported… and supported some more… A quick day turned into another long day with a lot of pieces of metal to cut and weld in place…I used the plasma cutter to cut the end caps then welded those in place. In making the ribs, I made one that i liked then matched the rest.
The exterior baking doors have so many pieces to them and so many roles… These doors need to keep the heat in but as i learned when i tossed an entire pallet into the oven, they regulate the air…very important unless you like seeing flame coming out the top of the chimney. You can get a fire going and fill it with wood and then walk away. A nice regulated burn results. I am not sure how to calculate the size of the vent… this was a guess as a few things have been along the way. These doors will also serve as a redundancy for retaining steam when baking. Turtle Rock Masonry has an insulated door with a vent door in it… This is my version. I used a rigid insulation from chiz brothers in pittsburg – very reasonable in price and perfect for this application.
Sorry about the lousy image quality…a ring fell off the camera and i ignored it…so i got a bunch of light bleeding into the exposure…grrr.. Need to reach the damper from the outside so that meant an extension…and yes i walked into the pointy end of my temporary damper handle…modified the exterior hearth so that just a clean frame sticks proud of the back surface… the gauges were inserted from the interior side to make them cleaner looking..then finally to cap all the mess…
Rear cap all in place… gauges semi installed…damper extension and insulation re-installed
Insulation is a nasty business…wear a respirator, eye glasses and cover all skin….and you will still be itchy at the end of it…Cold shower after helps to tighten the pores and keep the insulation from burrowing in…UGGH. So this is good quality insulation 8 lb. 2 inch thick. The thickness does not matter much…but the thicker the insulation the fewer pieces you handle. I used a kitchen knife (serrated are the best) and a straight edge to make the cuts…worked great. A frame wraps around the entire oven held up by gussets and a couple of cross braces. This frame will support the insulation and the side panels. Side panels were welded from the inside to keep the look clean and the bottom edge of the metal .060 slips over and registers to the bottom edge of the frame. The idea being to limit the amount of water that might get inside. This metal shell allows me to start using the oven.
More refractory material KS4V-plus… had some extra and thought a bit more mass on top of the brick would be good for strengthening the arch… now the arch and the hearth have equal amounts of material. Foil first..the concrete vibrator allows the material to settle and so pushes the air captured to the surface. Enough material for a healthy inch thick cap.
Ready for welding. The baking door is fully encased on the bottom half making it mostly air tight. The outer hearth will frame the outer doors and protrude through the rear wall. The patches are from a fix i needed to make to ensure that the door moves freely.